Integrating a model convincingly into an actual video shot is definitely a challenge. Especially when you have elements in the video that’s moving, the camera is moving, the lighting is diffused and the model has specific movements required to enhance it’s realism. In this case, the road was a little bumpy and the car had to move over it like you’d expect it to, with the suspension moving with the irregularities in the road and the car rocking slightly as a result. Very subtle. A lot of work for a few seconds but with remarkable results.